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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aca9e4e83aaea9c51ba46a89e33e2bd7a8fbaf32a547a433427766a08e90773' 
  AND token = '4p8ScIY9589Y9+K9EvHCjTVWE4oeM43s0bUHp6neryI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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