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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02fbdcacdc79b39c26fbc9b0139f28887f6e6fca5948974a40d4349773feead7' 
  AND token = 'iO54Fshn3TSBhvNTPaumBVnzuSiHG5fqW4tgFOZGnxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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