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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6a479532d7d5aa57e89d2af104863748254a701162c754f9db5d3a89802f47' 
  AND token = '/F2GLMc7fftalW3Zmyw0DGTTilpUVRtZv6ZJpjREovk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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