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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe1c7a87546de89c3fc3fc74b5cfeef76a31923d75ffff3a829a6bed47f7c1db' 
  AND token = 'pjNOd/kR/0OJTshnpRJk8YnL1m0l5v+TPzM4h6yvECg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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