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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee8d9bf5cdd96672f5cb9874f7c0bfbbd9d19a4934b89fe4ed2a1374a50da8d4' 
  AND token = 'qlXEoo4N2HU445fpJ4kqmYboxir0ZmhFjAqcvfRkChg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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