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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2bac3d93521b53fc0400a32cc52a136e05b8de194f47e50fc7d23f979cb1513' 
  AND token = 'D6YC8COnA7DVHYjBsROlhe4EXGFIZ5NA1A1IWV/O2Kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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