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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c36961f666d79b1db237d4eef97098c3e357f47a1bca7236a076a7a83ea1ace' 
  AND token = 'v5PTtB4uc1SFXeE3AXWGTo9JBYFpcQVZaOj6BDQZAsk=' 
  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"
    }
  }
}