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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea029c761dc75bde9473f21787f56c62d967074f995737a900bcf736f7c44a9d' 
  AND token = '444CDTi9MUQouaiWed2PrZJcEqgTFj/4j9UhJCOC19M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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