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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2123eaaf986eae114681c06894f3ac41b8e285294e00da82e276902199f99ab8' 
  AND token = 't0wkLe7Y6156YnQaHBT2xkaM1WNLe0ENi559o7vV3Pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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