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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b68b0aceedfd1b313530bd7d54a45fa56e30feaed2de53aa1cfcd3de81576f' 
  AND token = 'xi1lIkLApWPQsYPArTV/6Mizh3doR+muV7xQJPUM3WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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