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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0ce8723aded46b2e5536b0dbeaaa542f3594a6140382dd01b2cbe9c74237cd2' 
  AND token = 'DryyCgAS9HoNAF1AeTgpVMSygxgYGbGekZ5g6wVoGtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}