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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45550870213d98e6fa4466786bd267b9d682e4959c592c52c7499a92e34bc8ba' 
  AND token = 'Yhi7x6X2TWs+Jdb09sZ+ZrFvlD9pHHMa6N+dR7z9F9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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