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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '724fcc76edc6acf9cecae9be6879d85f8ef97783af80e0af0ead1d15b9401d24' 
  AND token = '/zEO8WLeSm/E+8JX8zYxZlazvYlGiyolgvD6mWizVoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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