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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cefb6270292c87505c8e9daa0edf8a75aae773115406ed94e7425d43e0d185f6' 
  AND token = 'N+USdBQS6M0k7RL196sACqAxdpBkfmzuQiXZM8n/2NI=' 
  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"
    }
  }
}