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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c504a4713899663a39384ca5be8e59462f87c4633cc9379a5e1ba0d76a6b48a2' 
  AND token = 'omivtfD0eGQPqYV3BHC4FDce36LVatHhM1gcOd6I9VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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