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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '957be4f4eef846224b3d7482f449ba8d0eab8e8e7a7120ea3b33223e1404e9aa' 
  AND token = 'c2CV0m+vS9g/wf+uJNqh+18sjcyuFLAdadKQpOdikhY=' 
  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"
    }
  }
}