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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3f4bfbc957e2b5a97f63af9b6aa3f33568aa579c0c17d6cac5926dd4060f277' 
  AND token = 'oZCFwLKyUh6y3L9MAawivQsF7UgeMnJKDbwHKYye1bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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