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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e036d5e15dc4e6ed2508363400123a327af8c80433b672b1f83b794f8eea6a2' 
  AND token = '8VF4CzuAh91IwEW4ZzfOnZH8ZvCwF5pezAaMEOoeIQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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