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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a67a895baa08fc689fcde3db7954c7ec202a14091e64756a6d704bd5e9a152f0' 
  AND token = 'VObuXFhy3tJ2adK/1XHbWFLlMXCin/2PPY3cjloek4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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