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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18d95edbad30c8a4abf6fe319376b1b900de52b80a7d89f448332ae946950114' 
  AND token = 'jhKhiLMJXm5S6K/ONYMcRSpm6BvWIOfRPdRrLFcUPDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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