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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb9c7aac7ee8bbbfe7974132d68f79472d2067af71f86818ab92660fc80f3d7b' 
  AND token = 'HHz60MN4rRnrfN4N8Nzo2pExkgMyuhdOYxDwzdnly3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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