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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ea0c3f7daa008bcaf11735a9f492b4aa47b228e22c9afbe23c58bc273630fc' 
  AND token = 'tWhG4yHk6nvRUJTF+BmPjJ3h24vyY8CTqWc2DU06PQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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