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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68b8059cf35ff51fee87460786630dd005988bdb89c8cef5d21c83732fb3d75a' 
  AND token = '9IvF9vCf73WDxZ4xaFixF83j7MzZ9wDD6dK06l9FUPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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