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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d17d4c7c1408760d335c058f0ef93b62546879e9495844ca6c77e761f353f47' 
  AND token = 'xKdP2YxWoO5bE/9rE0qs8jnGbKqn8cHnkAgZewkyAJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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