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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '870c44e838c9f7a449c5a820a818845ceab040854c39d886a3fd3b1c59aba05a' 
  AND token = 'y430yvXU1DpJuwGdh9L+QmpfM6vmg1/wwh3isIYwqjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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