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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ae90cf5263c73dd32d53ac27d5b23d6fe359764cb8d515256a9d86785dc23bf' 
  AND token = 'waeozVuXHLA5uasZ1JQ4juH/NVjvdmEi1IDCdLVSzos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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