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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07f48e48700f6a49ef51c457b151caf9eb0379098011287223bb78e98e8127ea' 
  AND token = 'idOyMbEBp3Mo31SztZlguUTHZ6owQsbd7Uee/m1PoQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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