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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd8605b8a8277df7e8c66420bd686babb6ce176b40334bf823745c7bd4b762bd' 
  AND token = 'OuYHt6PKN2/0Jz8v5osmsYFBJpd/rRST9ZYTs5krDuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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