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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6399b7e2e93351e353e95572bd4d20035611003e7b062ccf43f89a4e1d44017' 
  AND token = 'y2UlfM1qVq5yDKMRdlgCvUqPw1tZ6XVgi7aozv0H/L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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