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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19bbb49bba41085a686516ed9f6759a099d3f6154c0ad3a66c5470e8f7f760b4' 
  AND token = 'Ay7zdAlWtnXjjZj+hNJTkenRyBG2drgDE4PDS5y7y5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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