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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94e6644ad058e5b01b294a00ffb490cf11e9f9e59b41e98779eeec1ef1636371' 
  AND token = 'MZt8i4BPDhRcVwK+5wei4k+H86h4N7F19FEz5uCrGXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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