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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b50cdedb8825bbb3e508e22aaf9d1447de4e5f9948cac2c56d200a029df17aa' 
  AND token = 'H9nngkOQp9vLyjuUDi9P+QMSprPmek17bKVoHicia04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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