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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41563a2a8c3878ac5be5fa13d247aaa06b0e26429c1f35a8bd763e5b5caffb50' 
  AND token = 'qNgE0vKztv1F+xIctDzeHX/m3uTp4JfWcBn8EFSIA4o=' 
  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"
    }
  }
}