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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5e7d5944736b4767c6f6e365ecb55f5b74b41306c6b586059c1c4fea6c68650' 
  AND token = '11d69oDpmy+leLfLQ1k/AgOt7mN4eGR281x10BlEZqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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