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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d44ba29e4a28c318d6bc1bf93a4c5cb11e84bf44c8a1f4b5bd03a1229c49236' 
  AND token = '9vhshDZQL+duJjjRSOhJloSZQapwP8hp1N8iJUNaZLs=' 
  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"
    }
  }
}