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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dfc47ae7184605b1f052bdb9b405cea83bc9d666342f4b68d609e7f7f48790f' 
  AND token = 'T5Zj3wGn/8G8SFSy036P1L3TI7wnseRGMH0roPytPe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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