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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94293a011191a6ef93022392dd081aa6c4e10a64854fc2377abb4ff03bfea664' 
  AND token = 'sxvRg1/mo3rRCzaw6BzA1FmjkBwp0UWt6hwO4n0ieSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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