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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '770befa03858887f711ecd33937ae06b33c617d1133c2df85a5345eeafe6ec3a' 
  AND token = 'I6zjR3CNu9pBlEQcWA3kzeKMo07hfFvQTCkkn5crlqA=' 
  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"
    }
  }
}