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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bfe96219aa7e7f47b472ba1879bc81e7dd7a87a5b67e80f4fd227ab01942cdf' 
  AND token = 'dGTkfGWF+gUZgRQH/t9obnL0Wy1giWwfFeGaLtbM4V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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