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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ee70361e624f2094d3971f079d92963a680ce62eb7b56d6d35331f4dd059a81' 
  AND token = '0WGpTZ5vbrJ6V0eGIGjDo/C4oVIWNdNsJgOFi/PSYHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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