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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b30fb15112d2966da0591cbbf6e2300e9a2fc6538f2005244862c359ea2a21b' 
  AND token = 'iojLVmyI///1Z1FlqmPgPomLI3PxAC6ePSIhNS+7Bmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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