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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afc24d521082e8d23e00c5b090bce49c19ba02fe751dce1b84991cf74d852c80' 
  AND token = 'KiBSE6ATAfdsQX2sdsaUHNhVREy5eMl+rxhyg5Ck1Hk=' 
  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"
    }
  }
}