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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1965307d8ecc1beb563c43933d2649db11b2e7ab2b98fd6e907a965bb1580081' 
  AND token = 'TcMTWIJt15dNndMyXg6XFuY4euiF9U2redRMg7cFrxE=' 
  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"
    }
  }
}