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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6691ed1435a8dacf13ada386c318173e83140be596df872e73a7202dc60a7c18' 
  AND token = 'cTcQVcuVLTrhhnhTBn3jZrdYztq4WeVeKdX/Dpxin6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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