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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc1336b460f16d6f0c6e314c1f37906517f928978ac50ad2efb7069b8619a046' 
  AND token = '4CiaiLpfjFEnSNwlv+fW6bq0XCHrxpEYx0DJ+mYx5OQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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