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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec3d7794edb7505464350ae4bc465dee8f1d3d9915c74f031d93e39e4944a84c' 
  AND token = '/VzsMIevHcobLq262Zq/xauJ1TqbNY2tgCbdsQRW5TE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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