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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b08c47a57e78f3a623c4523eab5dc462de30680dd4d76a0a7761f59c9a26edf1' 
  AND token = '5GGiURlu+5aTnHKEh2QA3inoSQTw7aT8x4epV+1Px7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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