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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '478163b87897341013a841cf5a6b1c39328c05d898ac362f46dfb6385606e310' 
  AND token = 'atZG3uLaHMMVpbDbELmARR7k5Zw8lHkwDOa4P+F4Itk=' 
  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"
    }
  }
}