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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '708f9d6f9edbc1e48c4ab5101c6f805971866b21d8b9cdcbc5766cc6f9a1b1fb' 
  AND token = 'SZyQJO9IBpVL5s7dzTV/UUqOjZ1BnEfvkpOMRSxqoUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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