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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '292c3f9668ac679b943476dcdc26277316bf2a0a7cc6fb1e5cf29e8aa0de1ea9' 
  AND token = 'pYObZ5ywAx4J+yqTpyD4bqrqf8jzoe45rf7iFE3dCrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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