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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32f122da33bc3ad3255c7ef9ea65885ea8b42fe08aa34b3a58e3ba7d0f16dd74' 
  AND token = 'e/rhQ59zEsiPaUZYaiLPrQzMIyLRQ9XUI7+C4rSMlrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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