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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c527a81c5a6f78b04b2e45eb1062aee4fef457ad627a7d07fa5b5aac4894712a' 
  AND token = 'pOgxj8Scy8Pww1K7R26k9KiDYkZHKjg18KyAeYET6qM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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