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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a4beef5eaf1e885ed3289b595c571b3c423688cdb25d7c051ce92c1ad08bf6d' 
  AND token = 'KMaNFk0ZLrnyaSrAgw3l/0O6yBtqTH+JEwTNKitW8Kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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