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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8da4b658e995c07770b8bc6ad3fc3a05a5fcc3a6813a43169e2f063dab4dbd3' 
  AND token = 'kN1dpH7grf4mlWq2gOcljJZtfnnABBoJGL64GjUFUW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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