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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc762f0a2af7219d9aaadb9a069f617818008a4e38bf367aea3b797a7f845368' 
  AND token = '8BAKDcboF5skSb6ggUAOSRmvCBdiXtrKNaQbqij1gA4=' 
  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"
    }
  }
}