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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '993f50ee6d374a7819921690954092047e81654b059ec7e575e7c604eb1c904b' 
  AND token = 'gUaihOcU6fjqz9k0zTg8Kwy0RpnCqmEJaiSwe0oCZyQ=' 
  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"
    }
  }
}