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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de1b2f73f447b781f41573949b736d44b664825c765cab8f394e39932e34e0e0' 
  AND token = 'AvWTEq+iQ66V6iehhlCK3COX6vi202Z40MagUfwJmxI=' 
  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"
    }
  }
}