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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e281efc2a1e94e9292f9d9f932b463db2b7601577b33485706732892c0a83b1' 
  AND token = 'DC7d3GsA+XHuOYWRvmTz8ypcrA84PWWRSfHrNufY+Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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