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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b35702baba8581ef3a4e5935584d81118932eed0865bbb865da661d0d5583905' 
  AND token = 'zuDHZULc5zhEZkoSpie8rapCgTnv84JbGBSVEFVzjn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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