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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61346d85401c33f0f41412502a1e8b0ee6126cea36c60a8da91e56d2022e5a48' 
  AND token = 'PWt0thCex4/E3cLzAXufNi27usCvDkn26fhWLCcXDow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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