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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbe3c00e6a92e0218398d2e03c6bb6739737724d611c58e1957093f7557ee8ed' 
  AND token = 'fIfAwH5QSS6yoW2atbQZrgCsGWNT873t/8ZYYH/aaYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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