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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e6f72fa8e5a3fb016b3c6aadbb0cac9bc407b2ff8a1ed34988eca3b36ba57f7' 
  AND token = '4566yr8yWQJ04ioMa0TMofKx9s10gPyKbDPfdmdivaM=' 
  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"
    }
  }
}