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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ae53ef7cc48231e19c6d45099f4d2c42fd73ca273db028ba0c500a8b4cef1b1' 
  AND token = 'xj2htgXigFjkjtETOKYtSVyz/msYWP0boN+rjYi2cX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00506

JSON explain

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