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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8d6fe276df7e94e6d4fdfa379d0f5874ff9c87db00bd1330be5212f870f37fc' 
  AND token = 'B81964avr4W0viX2dnYpJLXeEslGCrK9cxZFSa/Vq0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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