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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7055f5b51d45452937d618336cda48541c8515955427d132589b9e4a00c7b3cb' 
  AND token = 'pd/3yv/9k0kcEB786NhxQoFxbXEGSz5a7O5pjEEGdcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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