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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92ec8b21808acd23ed4a24eeaa305731fd5f2c61c40c806b8e54e9c7a8d75151' 
  AND token = 'XxvH2NTXFUGmY6FCwNldTIs58xU8+k33BXoq+1RBzuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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