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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4f3ad5ec60b4bc614e4032d0f08749bea28b91c9ed952e2c6878219224a53ef' 
  AND token = 'fsJhd0vYeY0jNgnCMKTyTx2SMJPcBJm5xg/+V2ezSF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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