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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '702a5edc20d28c1c63abf9ca515e1ecac6f57360716f48cc226a24eaaff5c4ff' 
  AND token = 'L0PNPd4WcrcPpJ8vBEh2OTk5zt77RHNSsJ9/2REeCfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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