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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4a58c5d892c7a32dc28be465a7bef2bcaf32ef523c520be6e08bba65525fbb0' 
  AND token = 'ZTO88WrW7yscdvRfAHBJVWgKwX1mFc31xlOKPMha5nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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