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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '287f3d5a5853834e0b336a981e6fee1807bc67d9f99280ef3df1c1622bf81899' 
  AND token = '+gdgYAjn9U1ubo6l92pdBLYL85kK2VzfO1OaFJx0N/Q=' 
  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"
    }
  }
}