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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a28cff6e061a131077af6508ef4be2a86c8f157cf4e272a661062f046d06561f' 
  AND token = 'v/SE2oF+W8mIsI2aC8hQnw6TID0w9rK/N+C/H4dAY18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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