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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc7dfbbe309172afa4cb4bcfa3179f07917cec80d1766e3588c891a9f1ca918' 
  AND token = 'xYFkclIWRXNIsRo7ZNEzkfif3o4pePtP3N6bK+1dmDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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